Is this switching power supply worth the money that it cost 18 volts @ 20 amp

[sam_sam_sam]

CapLeaker

Is there any load testing machine that can do what I want to do that has a computer interface to able to do data logging because this is what I am looking for

Or a voltage/current meter module that can handle at least 30 amp load that can do data logging that does not cost an arm and leg

[CapLeaker]

CapLeaker

Is there any load testing machine that can do what I want to do that has a computer interface to able to do data logging because this is what I am looking for

Or a voltage/current meter module that can handle at least 30 amp load that can do data logging that does not cost an arm and leg

Sure there is. The catch is the $$$. I suppose mine was one of the ones that came out in the first year. However, I do recall there are or were some rebranded ones of my machine. Would I buy another electronic load, probably… would I buy that exact one, hell no.
Got to admit I didn’t do any lurking at Ali lately either. Hopefully there is something better that this thing.

[sam_sam_sam]

At least we can try fixing your load tester. Hopefully parts for it are available for it too.

Well after working today at work I decided to look at the electronic load testing machine and I found some things that do not look good on the jumper that go between the mosfets and the mosfets connections to the board and I think I found one that is loose in soldering joint on one end I going to redo all of the jumpers and the mosfets to board one looks very questionable I do not think a picture of these joints you will not see much you have to look at it under a lighted magnifying glass to see the questionable joints I will take some pictures of this when I finish redo doing all soldering joints

Now what is interesting about these jumpers on this double sided board on one side they soldered but on other of board these soldering joint traces do not go anywhere and they are not soldered now I would think that you solder both sides so you would have the strength of connections now that what I also going to do to make real good connections to the board for the mosfets

Now thes surface mount part well solder to the board so that does not concern me but the jumpers do concern me a lot so I going to take care of this issue and put it back together and see if there is any difference in its performance or not and go from there

[CapLeaker]

sam_sam_sam
umm… could have been a soldering defect from factory? Shit does happen… good plan… I’d do the same.

[sam_sam_sam]

sam_sam_sam
umm… could have been a soldering defect from factory? Shit does happen… good plan… I’d do the same.

Like I said earlier I will post some pictures of the boards when I finish resolder the jumpers and the mosfets I hope this solves the issue

[sam_sam_sam]

Well guess what this is another case of using too much flux because as I put heat to the jumpers flux bubble up on most of them and a couple of I thought might be loose they were now all of them are solid when you try to move them and one terminal on each board where the mosfets the middle one on each and the middle pin on each board at least they were consistent about doing a shite job might as well be consistent about it as you can see in the left hand picture and the right hand side of the picture I forgot to redo this one but when I go back to the shed I will redo it before I remount the circuit boards back on the heat sink

Updated

i put it back together and it did not change anything so there must be something wrong with the board it self I do not have a scope so it is going to be a little difficult for me to troubleshoot why the current meter is jumping around what I going to do is check with my multimeter on current and see if it is really jumping around or not if it is I not sure where to start troubleshooting it from and would you know it that it would be the bottom circuit board the hardest one to get to

For now I just going to use the channel that works and see if is just the meter that is having the issue or is it something else

One note if I had a scope I do not know if I remember exactly how to correctly use and how to interpret the results I had a crash course when I took industrial electrical and automation in college/trade school but that was over 15 years ago and I probably forgot a lot of it I do remember some of it only because of watching YouTube videos on how to repair switching power supplies

One other note I saw a YouTube video about the issue with this electronic load about a capacitor in PWM circuit that causes this issue but it is not the exact same model I am sure if it is the same issue or not